JPS6134231A - Cutting method and apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a method and apparatus for cutting elongated material into short lengths of predetermined dimensions. More specifically, the invention relates to fibers, preferably continuous filaments. It relates to a method of cutting into short lengths for use as reinforcing materials in plastic products.

Preferred elongate materials of the present invention are continuous filament materials, preferably polyester, nylon, Keppra[F]-, glass fibers, and the like. The elongated material is equally applicable to strip, ribbon, tape, film, wire or any other flexible material.

Prior Art In a modern process for forming sheet materials for molding plastic products such as automobile parts and helmets, glass fibers are fed from a creel package to a cutting mechanism and
Cut to staples and underneath? The resin paste passing through the belt is normally fed by gravity to the resin paste on a belt conveyor. Is the cutting mechanism comprised of multiple cutting blades rotating against a roll coated with polyurethane? Contains.

Is the glass fiber between the roll and the blade? It passes through and is cut or broken into a length corresponding to the distance between them.

Is this design made from a material that is not as brittle as polyester thread? It has been shown that it does not work well for cutting. The present invention is a long and thin elongated material to be included in a sheet material of a molding composition to be molded into a plastic product. Can be cut into staples? It is intended.

fiber? A transportable device adapted to cut short fibers into short lengths and deliver the short fibers to the surface being coated is disclosed in U.S. Pat. No. 3,011,257 to Bamberger. 51 One D roll that rotates in the opposite direction that engages with this roll is continuously drawn into the engagement area between the cutting bars? It is cut into short lengths as it passes through.

Many types of cutting devices and methods are known for cutting elongated material into short lengths. In particular, Kais (K
U.S. Patent Specification No. 485, 12 by Eith)
No. 0, US Patent Specification Letter 3 by Cook
．． 733.945 2 U.S. Patent Specification Letters 4.120.222 and 4.120.222 by Potter.
See No. 500.422. All of these cutting machines are widely used to cut very high denier tow two staple length fibers. The Kais patent cutting machine includes a rotatable reel with outwardly facing cutting blades against which the tow is wound, a fixed pressure roll forces the reel-wound tow, and the cutting blade The innermost layer of tow? disconnect. As the cutting progresses, the cut mass of stable fibers is pressed inward between a pair of adjacent ones. Another '7') pertains to an improvement to the device of the Kais patent, which allows the cut fibers to be removed.

U.S. Patent Specification Letters No. 3.942.401 and 3.945,280 by Roncato'
Is the number thread? It is operated in conjunction with a rotating support drum that supports and conveys it. Multiple radially extending cutting blades? and another rotating drum comprising: a method and apparatus for cutting yarn;
I'm giving you a pleading lesson. The rainbow vector element, located in the space between the cutting blades and provided on the cutting drum, acts strongly radially outwards due to centrifugal force and forces the yarn against the surface of the support drum. Compress. The compression of the thread is continuous;
This is done both longitudinally and transversely.

U.S. Pat. No. 3,118,336 to Hampshire includes a pair of rolls.

Both rolls are provided with an elastic coating, and a means for attaching the first and second rolls in a pressure engagement relationship such that the rolls are rubber coated and flattened so that both rolls can be rotated parallel to each other, and a strand is formed between the flattened coatings. means for holding it firmly and passing it between rolls, and carried by another roll. Usually surrounded by its elastic covering.

and at least one cutting blade supported circumferentially?
Do you have a fiber cutting machine? Teach. The blades are supported to prevent radial deflection and cut between the flattened coatings with the strands firmly held.

U.S. Patent Specification Letter 4.406,196 by Roncado et al.
The issue teaches another device for cutting thread,
According to this, the device includes a first rotatable drum having a smooth surface and a second rotatable drum having a plurality of cutting blades spaced apart from each other around the circumference of the outer surface of the drum and extending in the radial direction. ? have.

A centrifugal force responsive means consisting of a fin connected to a deformable ring is disposed between the two.

When the drum rotates, is there a thread on the drum with one smooth surface? The action of pressing, that is, the thread? The effect of putting it under continuous compression? play.

U.S. Patent Specification Letter 3 by Ahles et al.
．． No. 426,652 discloses a pair of rotatable (17') contacting 62 rotatable teeth having a series of flanged teeth secured to the circumference of the disk in a tow-like, advancing relationship between the teeth. Gripping disc and benefits? pass or cut;
And between multiple pairs of 1liI contact blades? A rotatable cutting member tuned to thread or a flying knife cutting machine? Including staple cutting machine? teaching.

According to the present invention, elongated material? Cut into short lengths
A method and apparatus are provided. How?

Keep elongated material? Compress transversely at discrete intervals, and elongated material during the intervals? The slightly tensioned elongated material is pulled slightly along its length and pressed against the cutting blade during the interval, and the elongated material is pulled with the cutting blade during the interval. It consists of a cutting process. The cutting blades are viewed in a spaced apart relationship and are arranged in a closed geometrical shape.
Figure ) Y: Preferably defined and rotated as a unit.

The present invention also provides an improved apparatus for cutting elongated material to length. The device consists of the device of the present invention. Both rolls rotate in opposite directions and the elongated material passes between them. The feature of the device of the present invention is that the second roll is coated with an elastic material. At least -f and the cutting roll extends radially beyond it by a protrusion of gL? It lies in having. At least one of these protrusions is located on each side of the cutting blade and extends radially from the normal σ) circumferential surface of the cutting roll higher than the blade. The sheathing of the second roll is successively engaged with the protrusions, compressing the elongate material therebetween.

The present invention further provides means for compressing the elongated material at discrete intervals, i.e. intervals, during which intervals the elongated material is compressed. A means of tension, and an elongated material consisting of a slightly tensioned material? Cut into short lengths'C7) Provide equipment.

DESCRIPTION OF THE PREFERRED EMBODIMENTS DRAWINGS OF THE INVENTION? As will be explained with reference to the drawings, like numbers refer to like numbers. Figure 1-5? Referring to:
Preferred; i-sheet molding compound (SM
C) The cutting machine 10 used in the spray-up process is mounted on a frame 11 parallel to the long axis of the roll so as to rotate in the opposite direction (see arrows in Figures 6 and 4). It includes a sticky cutting roll 20 and a pressure roll 25.

Is frame 11 a conveyor belt? The area below the cutting area defined between rolls 20 and 25 for horizontal passage? It is designed to be left open. The cut staples are placed on a sheet of resin paste on a conveyor belt (
(not shown) falls under heavy force.

Any conventional drive mechanism is suitable for rolls 20 and 25. Preferred mechanism 11C
, a motor (not shown) is connected to a timing belt 12 connected to a timing belt 9-. The shaft Y of the cutting roll 20 is driven via the shaft Y. Cutting roll 2017') The spur gear 15, which is keyed to the shaft, is connected to the pressure roll 25
A spur gear 14v is keyed to the shaft of the cutting roll and rotates with the shaft of the cutting roll to drive it. Does this mechanism rotate to pressure roll 25? bring about clearly.

Shaft of pressure roll 25? It is also possible to drive the timing belt 12 and drive the spur gear 15 to rotate the primary cutting roll 20Y.

The cutting roll 20 has a plurality of longitudinally extending and radially open grooves. The cutting blade 24 is received in the groove.

The cutting blade 24 is held in place by a retaining cap 15 screwed onto the end of the cutting roll 2o. The end of the blade 24 in contact with the holding cap 15 is an annular projection (not shown) extending from the holding cap 15? A notch (not shown) aligned with a groove (not shown) in the end of the cutting roll 20 for receiving? have. As seen in FIG. 4, the blades 24 extend radially from the cutting roll 20 and project slightly beyond the grooves 21. As seen in FIG.

The cutting roll has a plurality of radially extending projections shown as teeth 23 in FIG. have. Teeth 23 extend radially from the normal circumferential surface of roll 20 beyond the cutting edge of blade 24 . It may be left empty to change the cutting length of the blade 24.

Teeth 26 are shown as an integral part of cutting roll 20, which is the preferred embodiment. The teeth 26 and the portion between the blades 24 of the cutting roll 20 are made of a hard material.

Preferably made of metal, most preferably steel.

The cutting roll 20 may be hollow or solid, but
Preferably the latter, Rockwell C scale/l/
(Rockwell C5cale) (ASTME
-18-61) and a hardness of at least 20.

The pressure roll 25 is the contact surface or coating of the yarn ($4?
see) at least the teeth 26 from the cutting roll 200 surface.
It is elastic in the sense that it can be temporarily deformed by the teeth 26 to a depth of a protrusion distance of . Preferably, this resilient portion of pressure roll 25 has a hardness on the A scale as defined by ASTM D-785, ranging from 8Q to 95 durometers.

Polyurethane is a material of choice for coating the roll or for the roll itself because of its abrasion resistance.

The cutting roll 20 and the pressure roll 25 are connected to a plurality of jack bloks' and screws 16.
(See Figure 1?) and are pressed into engagement. Here, the term "meshing state" means the relationship shown in FIG.

Suitable covers and protective materials for the cutting machine 10? It may also be provided together with the fiber access guide. At around 180° from the cutting area, one fiber stripper 17 is placed over the long axes of both rollers, one on the side of the cutting roll 20 and one on the side of the pressure roll 25.

Each fiber stripper 17 faces a roll 2o or 25 and is adjacent F& thereto. (! La ha? Air duct with) Y configuration. air) IJ tube 1
7. Which fibers tend to stick to the rotating rolls 20 and 25 following cutting? Be supplied to blow away.

A guide mechanism 18 is provided for separating the yarn being fed to the cutting machine 10 and consists of a plurality of partitions mounted directly above the cutting area. The yarns are separated in mechanism 18 to enable cutting of various types of fibers with fist-cutting rolls 20. Glass fiber? Is that part of the cutting blade used to cut polyester without being sharpened or ground? cutting-
The f6 (it is not possible to use IIIC; the invention σ) machine therefore makes it possible to cut different types of fibers with the same cutting blade of the cutting device.

Next 9. A detailed operation method of the cutting machine 10 will be explained. To start the guide mechanism 18, the cover of the cutting machine is removed and the yarn is fed between each pair of partitions.

Then the air supply is switched on and the fiber
Air is supplied to the IJ collar 17. When the motor is turned on, the cutting roll 20 and the pressure roll 25 are rotated. These rolls are about 50-1400m
/min, preferably at a speed of 290 m/min.

The yarn 19 is compressed between the teeth 26 and the pressure roll 25 and then the yarn 7 is compressed as both rolls rotate through the cutting area.
Carry 19v. To explain with reference to FIG. 4, the primary tooth 26
When the yarn 19 hits the pressure roll 25 and is compressed, the yarn is tensioned by the two teeth 26 beyond the cutting edge of the blade 24. As the rolls 20 and 25 continue to rotate, the fifth tooth 23 Interlock with the 25v yarn 19, and the thread is cut by the blade 24. Referring to FIG. 4A, the yarn is cut when the blade 24 rotates to the position of the blade 24', which is the position where the roll 25 is deformed the most. Unfortunately, the tensioned yarn 19 is forced between the teeth 26 against the cutting edge of the blade 24 and is thereby cut. As the rotation continues,
The pressure roll 25 returns to its original shape and the cut staples fall into the resin paste below. In this way, the first tooth 23 compresses the yarn 19Y while engaging the pressure roll 25 of the polyurethane family.

As both rolls rotate and the second tooth 26 hits the polyurethane family pressure roll 25 and compresses the yarn 191, the yarn 19 hits the cutting edge of the blade 24. It is stretched or slightly tensioned across the teeth 25. As rotation continues, blade 24 cuts yarn 19Tt. Cutting blade 2
The number of four is selected depending on the desired fiber cut length.

Regarding the shape of teeth 26, Yarn-19Y: Pressure roll 25 without tearing? It can be of any shape as long as it can be deformed. That is, sharp teeth should not be used. Is the shape of tooth 2'5 flexible for staple length? To give.

Preferably, it is symmetrical, as shown in Figure 4, which allows for the addition or deletion of blades between the teeth.

Preferably, the blade 24 is made of steel.

It may be made of tungsten carbide.

In the preferred embodiment, the pitch circle of gears 16 and 14, and thus rolls 20 and 25, is 6 inches (15 cm). Teeth 26 project radially outwardly from the normal surface of roll 20 approximately 0.042 inches (0.107 crn). The cutting edge of blade 24 extends approximately 0.025 inches (0.064 crIM) radially outward from the normal surface of roll 20.
) stands out. The preferred number of protrusions/teeth 26 and grooves 21 is 76, each groove 21 being edged to cut the yarn into 0.25 inch (0.64 crn) staples. Blade 24 is located midway between teeth 26. With 24 blades and 68 blades in every other groove, the length of the cut staple is 0.50 inch (1,2'5 crn). The number of partitions in the guide mechanism is 25, and 24 yarns can be fed.

Cut to staple length of 0.25 inch (0.64 sub) f
6 For use with a manual chopper gun, when the diameter of the cutting roll 20 is approximately 2.1 inches (5.4 cm), cutouts 26 (see FIG. ) is required.

This notch allows the second tooth 26 to engage the pressure roll 26 before cutting the yarn 19. Approximately 4 inches (1
0) smaller diameter diameter, 0.25 inch (0,6
The cutting roll 20 for cutting into 4cm') has notches 26 as shown in FIG. It is considered necessary. 2.1 inches (5
, 4 crn), the depth and arc length of the notch 26 are 0.010 inch and 0.075 inch, respectively.
inches (0.025o++ and 0.191z).

As further described, the teeth 26 extend approximately 0.04 finch (0.119 m) radially outward from the normal surface of the roll 20.
It stands out. Teeth 2 closest to the center of the blade 24
The distance to the edge of 6 (rear blade 24) is approximately 0.060 inches (0.151 crn), ie, the blade 24 is much closer to the primary tooth 26 rather than being centered on the blade 26.

[Brief explanation of drawings]

Figure 1 shows the cover and guide mechanism? Cutting machine 10 of the present invention excluding
FIG. 2 is a plan view of the cutting machine 1 including the guide mechanism 18.
0 is a front view, the third is an end view of the cutting machine 10, and FIGS. 4 and 5 are detailed cross-sections of the cooperating cutting roll 20 and pressure (back-up) roll 25, respectively. It is a diagram. 10... 9JIFrll, 11... Frame, 17... Stripper, 18... Guide mechanism, 19... Yarn, 20... Cutting roll 21... Groove, 23... Teeth 24. ...cutting blade,
25...Pressure roll, 26...Notch Patent applicant Allied Corporation FIG, /

Claims (7)

[Claims] (1) (a) Compress the elongated material transversely at discrete intervals; (b) slightly tension the elongated material along its length between said intervals; (c) slightly tension the elongated material. and (d) cutting the elongated material with the cutting blade during said intervals. . (2) consisting of a rotatable cutting roll having a plurality of radially extending cutting blades and a second roll working in cooperation with the roll, both rolls rotating in opposite directions, between which an elongated material is cut; In the cutting device that is passed through and cut, the cutting roll has a plurality of radially extending projections, at least one of which is arranged on each side of the cutting blade, and The second roll extends radially higher than the blade from the cutting roll, and the second roll has an elastic material around its periphery, the elastic material being continuously engaged by the protrusion to create a gap between the two. 1. A device for cutting an elongated material into a predetermined length, the device being adapted to compress the elongated material at a speed. (3) means for compressing the elongated material at discrete intervals; means for tensioning the elongated material between said intervals; and said elongated material being slightly tensioned to finally cut said elongated material with a cutting blade. Apparatus for cutting elongated material into short lengths, characterized in that it comprises means for pressing the material against a cutting blade during said intervals. (4) The compression means comprises a pair of rotatable rolls through which the elongated material passes, one roll having a plurality of radially extending protrusions at said discrete intervals, and the other roll compressing the elongated material. is temporarily deformable along the circumference of the roll by each projection, and both rolls are rotated in opposite directions when stopped, and at least two of the front projections are 3. A device according to claim 3, which is mounted so as to contact and deform the circumferential surface of the other roll. (5) The tensioning means and the compression means are the same and are tensioned when the elongated material is compressed in two successive intervals between the projection and the other roll. ). (6) the cutting blade is attached to extend radially from the roll with one of the protrusions on either side thereof;
4. Apparatus according to claim 4, wherein said protrusion extends radially from said roll higher than said cutting blade. (7) The device according to claim (6), wherein when the two rolls rotate, the other roll constitutes the pressing means.